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2 Answers
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TreemapKit @ GitHub is one that works ok ... The only one written for iOS as far as I know. It works on the iPhone and iPad, but it doesn't redraw and rescale correctly when you rotate the device. I can't figure out how to fix that and the author is too busy to revisit

But you want applications ... There aren't any as far as I've seen, and I've been looking. This is largely due to the absence of a good ObjC library, save for TreemapKit. It does come with a demo though.